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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a92152dd2e02a03e1272f2f959353f7a9badc2b7c8cf4f31108c25cbfb0b6f8' 
  AND token = 'wfoVe7WCXck7zmuiVXoiai16HBUbKnT+wXPKcEf8Uek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}